I was re-reading this article & I don't think Dana meant the Win bonus. Mike's contractually gauranteed that money. I think Dana was referencing the mythical "Locker Room Bonuses" that the UFC infamously doles out in order to pay the fighters a much higher amount than they're recquire disclose, thus making it much toughre for other promotions to poach talent (since they would be aiming at the wrong dollar mark).

“He was not bonused for the fight, and believe me, it’s worse than anything that anyone else could have done.”White is likely alluding to confiscating Bisping’s ‘Win Bonus’ for his impressive 2ndRound TKO victory on February 27th.
I will keep my eyes peeled to see if any more on this topic so we know exactly what bonus Dana is referring to..